Kerberos Principal Name Canonicalization and KDC-Generated Cross-Realm Referrals
draft-ietf-krb-wg-kerberos-referrals-13

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Kerberos WORKING GROUP                                   S. Hartman, Ed.
Internet-Draft                                         Painless Security
Updates: 4120 (if approved)                                   K. Raeburn
Intended status: Standards Track                                     MIT
Expires: May 3, 2012                                              L. Zhu
                                                   Microsoft Corporation
                                                        October 31, 2011

 Kerberos Principal Name Canonicalization and KDC-Generated Cross-Realm
                               Referrals
                draft-ietf-krb-wg-kerberos-referrals-13

Abstract

   The memo documents a method for a Kerberos Key Distribution Center
   (KDC) to respond to client requests for Kerberos tickets when the
   client does not have detailed configuration information on the realms
   of users or services.  The KDC will handle requests for principals in
   other realms by returning either a referral error or a cross-realm
   TGT to another realm on the referral path.  The clients will use this
   referral information to reach the realm of the target principal and
   then receive the ticket.  This memo also provides a mechanism for
   verifying that a request has not been tampered with in transit.

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on May 3, 2012.

Copyright Notice

   Copyright (c) 2011 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal

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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
   2.  Conventions Used in This Document  . . . . . . . . . . . . . .  5
   3.  Requesting a Referral  . . . . . . . . . . . . . . . . . . . .  5
   4.  Realm Organization Model . . . . . . . . . . . . . . . . . . .  6
     4.1.  Trust Assumptions  . . . . . . . . . . . . . . . . . . . .  6
   5.  Enterprise Principal Name Type . . . . . . . . . . . . . . . .  7
   6.  Name Canonicalization  . . . . . . . . . . . . . . . . . . . .  8
   7.  Client Referrals . . . . . . . . . . . . . . . . . . . . . . . 10
   8.  Server Referrals . . . . . . . . . . . . . . . . . . . . . . . 11
   9.  Cross Realm Routing  . . . . . . . . . . . . . . . . . . . . . 12
   10. Caching Information  . . . . . . . . . . . . . . . . . . . . . 12
   11. Negotiation of FAST and Detecting Modified Requests  . . . . . 12
   12. Number Assignments . . . . . . . . . . . . . . . . . . . . . . 14
   13. IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 14
   14. Security Considerations  . . . . . . . . . . . . . . . . . . . 14
     14.1. Shared-password case . . . . . . . . . . . . . . . . . . . 16
     14.2. Preauthentication data . . . . . . . . . . . . . . . . . . 17